Pennsylvania had a law that allowed fugitive slaves to remain free once inside its borders. The court held that this state law was unconstitutional. As a result, the slave, whose name was Morgan, and her baby, were returned to their owners.

You might want to check the Q&A section, where this question has been answered in more detail. The short answer, however, is that the slave woman's name was Margaret Morgan. She came to Pennsylvania with her husband from Maryland, where she lived on a small, apparently independent dwelling on a plantation. After the case, which determined that she should be returned to her owner in Maryland, she went back, at which point the records fall silent. It is not, in fact, even known that she went back to her owner or if she was sold to another owner.